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What is the technical term for gray hair?

  1. Alopecia

  2. Hypertrichosis

  3. Canities

  4. Pityriasis

The correct answer is: Canities

Canities is the medical term used to refer to gray hair. This term is derived from the Latin word "canus" meaning gray or white. Alopecia is a term used to describe hair loss, which is different from gray hair. Hypertrichosis is a condition where there is excessive hair growth, also not related to gray hair. Pityriasis is a term used for skin conditions, such as dandruff, and is not related to gray hair. Therefore, the correct answer is C.